Hair straightener



FIG. 1 is a perspective view of the hair straightener, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof, looking from the right side of FIG. 2, the opposite side being a mirror image thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for the hair straightener, as shown and described. 